Based on his history it makers sense. Putin doesn't give a damn about Trump. He's simply stirring up trouble as almost no matter what happens Russia wins something. Right now US society at large is kinda tearing itself apart as it's international reputation and relations rapidly deteriorate and it's internal systems of a free press, democratic political system, the courts, the American intelligence system and more are all under attack. He sows distrust and mayhem pretty much wherever he decides to involve himself/Russia.
He's done this shit before although I'd have to say in the US situation he has so much help given the state of American politics and general civil society over the past 20 or 30 years. btw, I'm not referring to any kind of collusion, simply that the US is/was fertile ground for the kind of manipulation and interference that Putin/Russia has been using rather successfully for almost 20 years now.